Read about:
GRAV-D Reaches 100%
Multi-epoch Least-squares Adjustment Papers
https://www.ngs.noaa.gov/datums/newdatums/NSRSModernizationNewsIssue34.pdf
GRAV-D Reaches 100%
Multi-epoch Least-squares Adjustment Papers
https://www.ngs.noaa.gov/datums/newdatums/NSRSModernizationNewsIssue34.pdf